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Thanks EFLImpudence, RF Lighting and securespark for the replies i didnt realise it was that simple. :) So basically the older the install the lower the reading and even althought 1MOhm is the minimum your not really wanting anywhere near this as problems could start in the very near future.

Thanks for the reply, so on the meter if i get a reading of 143M Ohms then this is ok its even 3M Ohms is ok its only when it reaches 2 MOhms that things should be looked at? Is it that simple or have i got it all wrong? Thaks

Can someone please explain to me in lamans terns insulation resistance. So the meter reads >200 on 500v which means everything is ok but at what point is it a fail is it at 100 or 50 etc? And how does 1M ohm realtes to all this. Ive always had a bit of a hard time taking this in Cheers

Heres a couple of my own.. Can you spot the problem? Heres another one where i had an empy house to check out, the previous tentant stripped out the elec meter and taped the main feed together with the ring, lights hot water and shower, and same with the neutrals, all just taped together...

I dont know to much about it at the moment, we had the guy in from bosch telling us all about them as so many where bought, he said bosch is working on a programme that should be ready in a few months and they will be flashed with the software to pick up on plastic water/waste pipe etc. He...

I got one today from the work the Bosch DMF 10 Zoom, infact they bought 300 of them, after a play around today it is near enough pin point accurate. Detects wood, metal and electrics...